I got the error: 500 - An error has occurred. Unable to load pathway: administrator if i click on Virtuemart in Joomla-Backend (1.5)
Go to 500 - An error has occurred. Unable to load pathway: administrator, and comment out the lin:
mainframe->appendPathWay( $VM_LANG->_('PHPSHOP_CART_TITLE') );
All should work fine again.